Mobile device and optical imaging lens thereof

ABSTRACT

Present embodiments provide for a mobile device and an optical imaging lens thereof. The optical imaging lens comprises five lens elements positioned sequentially from an object side to an image side. Through controlling the convex or concave shape of the surfaces and/or the refracting power of the lens elements and designing an equation, the optical imaging lens shows better optical characteristics and the total length of the optical imaging lens is shortened.

INCORPORATION BY REFERENCE

This application claims priority from R.O.C. Patent Application No.102123325, filed on Jun. 28, 2013, the contents of which are herebyincorporated by reference in their entirety for all purposes.

TECHNICAL FIELD

The present invention relates to a mobile device and an optical imaginglens thereof, and particularly, relates to a mobile device applying anoptical imaging lens having five lens elements and an optical imaginglens thereof.

BACKGROUND

The ever-increasing demand for smaller sized mobile devices, such ascell phones, digital cameras, etc., correspondingly triggered a growingneed for a smaller sized photography module, comprising elements such asan optical imaging lens, a module housing unit, and an image sensor,etc., contained therein. Size reductions may be obtained from variousaspects of the mobile devices, which includes not only the chargecoupled device (CCD) and the complementary metal-oxide semiconductor(CMOS), but also the optical imaging lens mounted therein. When reducingthe size of the optical imaging lens, however, achieving good opticalcharacteristics become a challenging problem.

Both U.S. Pat. No. 7,480,105 and Japan Patent Publication No. 4197994disclose an optical imaging lens constructed with an optical imaginglens having five lens elements, wherein the length of the opticalimaging lens, from the object-side surface of the first lens element tothe image plane, reaches 8 mm, which is too long for smaller sizedmobile devices. Therefore, there is a need to develop an optical imaginglens which is capable of placing five lens elements therein, with ashorter length, while also have good optical characteristics.

SUMMARY

An object of the present invention is to provide a mobile device and anoptical imaging lens thereof. With controlling the convex or concaveshape of the surfaces and/or the refracting power of the lens elementsand designing an equation, the length of the optical imaging lens isshortened and meanwhile the good optical characteristics and systemfunctionality are maintained.

In an exemplary embodiment, an optical imaging lens comprises,sequentially from an object side to an image side along an optical axis,which comprises first, second, third, fourth and fifth lens elements,each of the first, second, third, fourth and fifth lens elements havingan object-side surface facing toward the object side and an image-sidesurface facing toward the image side. The object-side surface of thefirst lens element comprises a convex portion in a vicinity of theoptical axis. The second lens element has positive refracting power. Theimage-side surface of the fourth lens element comprises a convex portionin a vicinity of the optical axis. The image-side surface of the fifthlens element comprises a concave portion in a vicinity of the opticalaxis and a convex portion in a vicinity of a periphery of the fifth lenselement. The optical imaging lens as a whole comprises only the fivelens elements having refracting power and the distance between theobject-side surface of the first lens element and the image-side surfaceof the fifth lens element along the optical axis is TL. A centralthickness of the fifth lens element along the optical axis is CT5, andTL and CT5 satisfy the equation:TL/CT5≦7.80  Equation (1).

In another exemplary embodiment, other equation(s), such as thoserelating to the ratio among parameters could be taken intoconsideration. For example, a central thickness of the third lenselement along the optical axis is CT3. An air gap between the secondlens element and the third lens element along the optical axis is AC23.An air gap between the third lens element and the fourth lens elementalong the optical axis is AC34, that could be controlled to satisfy theequation as follows:1.10≦(AC23+AC34)/CT3  Equation (2); or

TL and the sum of all four air gaps from the first lens element to thefifth lens element along the optical axis, AAG, could be controlled tosatisfy the equation(s) as follows:4.30≦TL/AAG  Equation (3); or

CT3, CT5 and a central thickness of the first lens element along theoptical axis, CT1, could be controlled to satisfy the equation asfollows:3.75≦(CT1+CT5)/CT3  Equation (4); or

TL, AC23, an air gap between the first lens element and the second lenselement along the optical axis, AC12, and an air gap between the fourthlens element and the fifth lens element along the optical axis, AC45,could be controlled to satisfy the equation as follows:9.80≦TL/(AC12+AC23+AC45)  Equation (5); or

CT5, AC12, AC23 and AC45 could be controlled to satisfy the equation asfollows:1.85≦CT5/(AC12+AC23+AC45)  Equation (6); or

CT3 and a central thickness of the fourth lens element along the opticalaxis, CT4, could be controlled to satisfy the equation as follows:1.60≦CT4/CT3≦3.40  Equation (7); or

AC12, AC23 and AC45 could be controlled to satisfy the equation asfollows:AC23/(AC12+AC45)≦2.00  Equation (8); or

AC12, AC23, AC34 and AC45 could be controlled to satisfy the equation asfollows:1.60≦AC34/(AC12+AC23+AC45)  Equation (9); or

CT1, AC12, AC23 and AC45 could be controlled to satisfy the equation asfollows:1.80≦CT1/(AC12+AC23+AC45)  Equation (10); or

CT4, AC12 and AC45 could be controlled to satisfy the equation asfollows:5.50≦CT4/(AC12+AC45)  Equation (11); or

TL and AC34 could be controlled to satisfy the equation as follows:TL/AC34≦10.30  Equation (12); or

CT1, CT3, CT4 and CT5 could be controlled to satisfy the equation asfollows:4.00≦(CT1+CT4+CT5)/CT3  Equation (13); or

AAG and AC34 could be controlled to satisfy the equation as follows:AAG/AC34≦1.60  Equation (14).

Aforesaid exemplary embodiments are not limited and could be selectivelyincorporated in other embodiments described herein.

In some exemplary embodiments, more details about the convex or concavesurface structure or the position of an aperture stop could beincorporated for one specific lens element or broadly for plural lenselements to enhance the control for the system performance and/orresolution. For example, an aperture stop could be positioned before thefirst lens element, etc. It is noted that the details listed here couldbe incorporated in example embodiments if no inconsistency occurs.

In another exemplary embodiment, a mobile device comprising a housingand a photography module positioned in the housing is provided. Thephotography module comprises any of the aforesaid example embodiments ofoptical imaging lens, such as, a lens barrel, a module housing unit andan image sensor. The lens barrel is for positioning the optical imaginglens, the module housing unit is for positioning the lens barrel, thesubstrate is for positioning the module housing unit and the imagesensor is positioned at the image side of the optical imaging lens.

Through controlling the convex or concave shape of the surfaces and/orthe refraction power of the lens element(s), the mobile device and theoptical imaging lens thereof in exemplary embodiments achieve goodoptical characteristics and effectively shorten the length of theoptical imaging lens.

BRIEF DESCRIPTION OF THE DRAWINGS

Exemplary embodiments will be more readily understood from the followingdetailed description when read in conjunction with the appended drawing,in which:

FIG. 1 is a cross-sectional view of one single lens element according tothe present disclosure;

FIG. 2 is a cross-sectional view of a first embodiment of an opticalimaging lens having five lens elements according to the presentdisclosure;

FIG. 3 is a chart of longitudinal spherical aberration and other kindsof optical aberrations of a first embodiment of the optical imaging lensaccording to the present disclosure;

FIG. 4 is a table of optical data for each lens element of a firstembodiment of an optical imaging lens according to the presentdisclosure;

FIG. 5 is a table of aspherical data of a first embodiment of theoptical imaging lens according to the present disclosure;

FIG. 6 is a cross-sectional view of a second embodiment of an opticalimaging lens having five lens elements according to the presentdisclosure;

FIG. 7 is a chart of longitudinal spherical aberration and other kindsof optical aberrations of a second embodiment of the optical imaginglens according to the present disclosure;

FIG. 8 is a table of optical data for each lens element of the opticalimaging lens of a second embodiment of the present disclosure;

FIG. 9 is a table of aspherical data of a second embodiment of theoptical imaging lens according to the present disclosure;

FIG. 10 is a cross-sectional view of a third embodiment of an opticalimaging lens having five lens elements according to the presentdisclosure;

FIG. 11 is a chart of longitudinal spherical aberration and other kindsof optical aberrations of a third embodiment of the optical imaging lensaccording the present disclosure;

FIG. 12 is a table of optical data for each lens element of the opticalimaging lens of a third embodiment of the present disclosure;

FIG. 13 is a table of aspherical data of a third embodiment of theoptical imaging lens according to the present disclosure;

FIG. 14 is a cross-sectional view of a fourth embodiment of an opticalimaging lens having five lens elements according to the presentdisclosure;

FIG. 15 is a chart of longitudinal spherical aberration and other kindsof optical aberrations of a fourth embodiment of the optical imaginglens according the present disclosure;

FIG. 16 is a table of optical data for each lens element of the opticalimaging lens of a fourth embodiment of the present disclosure;

FIG. 17 is a table of aspherical data of a fourth embodiment of theoptical imaging lens according to the present disclosure;

FIG. 18 is a cross-sectional view of a fifth embodiment of an opticalimaging lens having five lens elements according to the presentdisclosure;

FIG. 19 is a chart of longitudinal spherical aberration and other kindsof optical aberrations of a fifth embodiment of the optical imaging lensaccording the present disclosure;

FIG. 20 is a table of optical data for each lens element of the opticalimaging lens of a fifth embodiment of the present disclosure;

FIG. 21 is a table of aspherical data of a fifth embodiment of theoptical imaging lens according to the present disclosure;

FIG. 22 is a cross-sectional view of a sixth embodiment of an opticalimaging lens having five lens elements according to the presentdisclosure;

FIG. 23 is a chart of longitudinal spherical aberration and other kindsof optical aberrations of a sixth embodiment of the optical imaging lensaccording the present disclosure;

FIG. 24 is a table of optical data for each lens element of the opticalimaging lens of a sixth embodiment of the present disclosure;

FIG. 25 is a table of aspherical data of a sixth embodiment of theoptical imaging lens according to the present disclosure;

FIG. 26 is a cross-sectional view of a seventh embodiment of an opticalimaging lens having five lens elements according to the presentdisclosure;

FIG. 27 is a chart of longitudinal spherical aberration and other kindsof optical aberrations of a seventh embodiment of the optical imaginglens according the present disclosure;

FIG. 28 is a table of optical data for each lens element of the opticalimaging lens of a seventh embodiment of the present disclosure;

FIG. 29 is a table of aspherical data of a seventh embodiment of theoptical imaging lens according to the present disclosure;

FIG. 30 is a cross-sectional view of a eighth embodiment of an opticalimaging lens having five lens elements according to the presentdisclosure;

FIG. 31 is a chart of longitudinal spherical aberration and other kindsof optical aberrations of a eighth embodiment of the optical imaginglens according the present disclosure;

FIG. 32 is a table of optical data for each lens element of the opticalimaging lens of a eighth embodiment of the present disclosure;

FIG. 33 is a table of aspherical data of a eighth embodiment of theoptical imaging lens according to the present disclosure;

FIG. 34 is a table for the values of TL/CT5, (AC23+AC34)/CT3, TL/AAG,(CT1+CT5)/CT3, TL/(AC12+AC23+AC45), CT5/(AC12+AC23+AC45), CT4/CT3,AC23/(AC12+AC45), AC34/(AC12+AC23+AC45), CT1/(AC12+AC23+AC45),CT4/(AC12+AC45), TL/AC34, (CT1+CT4+CT5)/CT3 and AAG/AC34 of all eighthexample embodiments;

FIG. 35 is a structure of an example embodiment of a mobile device; and

FIG. 36 is a partially enlarged view of the structure of another exampleembodiment of a mobile device.

DETAILED DESCRIPTION

For a more complete understanding of the present disclosure and itsadvantages, reference is now made to the following description taken inconjunction with the accompanying drawings, in which like referencenumbers indicate like features. Persons having ordinary skill in the artwill understand other varieties for implementing example embodiments,including those described herein. The drawings are not limited tospecific scale and similar reference numbers are used for representingsimilar elements. As used in the disclosures and the appended claims,the terms “example embodiment,” “exemplary embodiment,” and “presentembodiment” do not necessarily refer to a single embodiment, although itmay, and various example embodiments may be readily combined andinterchanged, without departing from the scope or spirit of the presentinvention. Furthermore, the terminology as used herein is for thepurpose of describing example embodiments only and is not intended to bea limitation of the invention. In this respect, as used herein, the term“in” may include “in” and “on”, and the terms “a”, “an” and “the” mayinclude singular and plural references. Furthermore, as used herein, theterm “by” may also mean “from”, depending on the context. Furthermore,as used herein, the term “if” may also mean “when” or “upon”, dependingon the context. Furthermore, as used herein, the words “and/or” mayrefer to and encompass any and all possible combinations of one or moreof the associated listed items.

Here in the present specification, “a lens element having positiverefracting power (or negative refracting power)” means that the lenselement has positive refracting power (or negative refracting power) inthe vicinity of the optical axis. “An object-side (or image-side)surface of a lens element comprises a convex (or concave) portion in aspecific region” means that the object-side (or image-side) surface ofthe lens element “protrudes outwardly (or depresses inwardly)” along thedirection parallel to the optical axis at the specific region, comparedwith the outer region radially adjacent to the specific region. TakingFIG. 1, for example, the lens element shown therein is radiallysymmetric around the optical axis which is labeled by I. The object-sidesurface of the lens element comprises a convex portion at region A, aconcave portion at region B, and another convex portion at region C.This is because compared with the outer region radially adjacent to theregion A (i.e. region B), the object-side surface protrudes outwardly atthe region A, compared with the region C, the object-side surfacedepresses inwardly at the region B, and compared with the region E, theobject-side surface protrudes outwardly at the region C. Here, “in avicinity of a periphery of a lens element” means that in a vicinity ofthe peripheral region of a surface for passing imaging light on the lenselement, i.e., the region C as shown in FIG. 1. The imaging lightcomprises chief ray Lc and marginal ray Lm. “In a vicinity of theoptical axis” means that in a vicinity of the optical axis of a surfacefor passing the imaging light on the lens element, i.e., the region A asshown in FIG. 1. Further, a lens element could comprise an extendingportion E for mounting the lens element in an optical imaging lens.Ideally, the imaging light would not pass the extending portion E. Herethe extending portion E is only for example, the structure and shapethereof are not limited to this specific example. Please also note thatthe extending portion of all the lens elements in the exampleembodiments shown below are not shown in order to maintain clean andconcise drawings.

Example embodiments of an optical imaging lens may comprise a first lenselement, a second lens element, a third lens element, a fourth lenselement and a fifth lens element, each of the lens elements comprise anobject-side surface facing toward an object side and an image-sidesurface facing toward an image side. These lens elements may be arrangedsequentially from the object side to the image side along an opticalaxis, and example embodiments of the lens as a whole may comprise onlythe five lens elements having refracting power. In an exampleembodiment: the object-side surface of the first lens element comprisesa convex portion in a vicinity of the optical axis; the second lenselement has positive refracting power; the image-side surface of thefourth lens element comprises a convex portion in a vicinity of theoptical axis; the image-side surface of the fifth lens element comprisesa concave portion in a vicinity of the optical axis and a convex portionin a vicinity of a periphery of the fifth lens element; and the distancebetween the object-side surface of the first lens element and theimage-side surface of the fifth lens element is TL, a central thicknessof the fifth lens element along the optical axis is CT5, and TL and CT5satisfy the equation:TL/CT5≦7.80  Equation (1).

Preferably, the lens elements are designed in light of the opticalcharacteristics and the length of the optical imaging lens. For example,the second lens element having positive refracting power can assist inincreasing the light convergence ability of the optical imaging lens,and combined with the aperture stop positioned before the first lenselement, the length of the optical imaging lens can be effectivelyshortened. All the details of shape on the surfaces of the lenselements, such as the convex portion in a vicinity of the optical axison the object-side surface of the first lens element, the convex portionin a vicinity of the optical axis on the image-side surface of thefourth lens element, the concave portion in a vicinity of the opticalaxis on the image-side surface of the fifth lens element and the convexportion in a vicinity of a periphery of the fifth lens element on theimage-side surface thereof, could assist in eliminating the aberrationof the optical imaging lens. Additionally, all these details couldpromote the image quality of the whole system.

In another exemplary embodiment, some equation(s) of parameters, such asthose relating to the ratio among parameters could be taken intoconsideration. For example, a central thickness of the third lenselement along the optical axis, CT3, an air gap between the second lenselement and the third lens element along the optical axis, AC23, an airgap between the third lens element and the fourth lens element along theoptical axis, AC34, could be controlled to satisfy the equation asfollows:1.10≦(AC23+AC34)/CT3  Equation (2); or

TL and the sum of all four air gaps from the first lens element to thefifth lens element along the optical axis, AAG, could be controlled tosatisfy the equation(s) as follows:4.30≦TL/AAG  Equation (3); or

CT3, CT5 and a central thickness of the first lens element along theoptical axis, CT1, could be controlled to satisfy the equation asfollows:3.75≦(CT1+CT5)/CT3  Equation (4); or

TL, AC23, an air gap between the first lens element and the second lenselement along the optical axis, AC12, and an air gap between the fourthlens element and the fifth lens element along the optical axis, AC45,could be controlled to satisfy the equation as follows:9.80≦TL/(AC12+AC23+AC45)  Equation (5); or

CT5, AC12, AC23 and AC45 could be controlled to satisfy the equation asfollows:1.85≦CT5/(AC12+AC23+AC45)  Equation (6); or

CT3 and a central thickness of the fourth lens element along the opticalaxis, CT4, could be controlled to satisfy the equation as follows:1.60≦CT4/CT3≦3.40  Equation (7); or

AC12, AC23 and AC45 could be controlled to satisfy the equation asfollows:AC23/(AC12+AC45)≦2.00  Equation (8); or

AC12, AC23, AC34 and AC45 could be controlled to satisfy the equation asfollows:1.60≦AC34/(AC12+AC23+AC45)  Equation (9); or

CT1, AC12, AC23 and AC45 could be controlled to satisfy the equation asfollows:1.80≦CT1/(AC12+AC23+AC45)  Equation (10); or

CT4, AC12 and AC45 could be controlled to satisfy the equation asfollows:5.50≦CT4/(AC12+AC45)  Equation (11); or

TL and AC34 could be controlled to satisfy the equation as follows:TL/AC34≦10.30  Equation (12); or

CT1, CT3, CT4 and CT5 could be controlled to satisfy the equation asfollows:4.00≦(CT1+CT4+CT5)/CT3  Equation (13); or

AAG and AC34 could be controlled to satisfy the equation as follows:AAG/AC34≦1.60  Equation (14).

Aforesaid exemplary embodiments are not limited and could be selectivelyincorporated in other embodiments described herein.

Reference is now made to Equation (1). TL/CT5 is composed by a parametermore likely to be varied, i.e., TL here, and a parameter less likely tobe varied, i.e., CT5 here. Shortening of CT5 is limited by itssignificant effective diameter, but shortening of TL is a way to shortenthe length of the optical imaging lens. Therefore with the help ofEquation (1), the values of TL and CT5 can be effectively reduced andcontrolled within a proper range, as well as the length of the opticalimaging lens. Additionally, the value of TL/CT5 is suggested for a lowerlimit, such as 4.0≦TL/CT5≦7.8.

Reference is now made to Equation (2). Considering the smaller effectivediameter of the third lens element that provides greater potential toshorten its thickness as well as the length of the optical imaging lens,here the equation is designed. When Equation (2) is satisfied, thevalues of CT3, AC23 and AC34 are configured properly. Additionally, thevalue of (AC23+AC34)/CT3 is suggested for an upper limit, such as1.10≦(AC23+AC34)/CT3≦2.50.

Reference is now made to Equation (3). The equation is designed toaddress the difficulty faced and precision required in the assemblyprocess which limits the shortening of the air gaps. When Equation (3)is satisfied, the thickness of each lens element and each air gap areconfigured properly. Additionally, the value of TL/AAG is suggested foran upper limit, such as 4.30≦TL/AAG≦6.60.

Reference is now made to Equations (4). Considering shortening of CT5 islimited by its significant effective diameter and shortening of CT3 hasmore potential due to its smaller effective diameter, here the equationis designed for configuring CT1, CT3 and CT5 properly. Additionally, thevalue of (CT1+CT5)/CT3 is suggested for an upper limit, such as3.75≦(CT1+CT5)/CT3≦6.00.

Reference is now made to Equation (5). Considering the difficulty facedand precision required in the assembly process which limits theshortening of the air gaps, here the equation is designed. When Equation(5) is satisfied, the values of TL, AC12, AC23 and AC45 are configuredproperly. Additionally, the value of TL/(AC12+AC23+AC45) is suggestedfor an upper limit, such as 9.80≦TL/(AC12+AC23+AC45)≦17.00.

Reference is now made to Equation (6). The equation is designed toaddress that the shortening of CT5 is limited by its significanteffective diameter. When Equation (6) is satisfied, the values of CT5,AC12, AC23 and AC45 are configured properly. Additionally, the value ofCT5/(AC12+AC23+AC45) is suggested for a lower limit, such as1.85≦CT5/(AC12+AC23+AC45)≦3.70.

Reference is now made to Equation (7). Considering shortening of CT3 hasmore potential than shortening of CT4 due to the smaller effectivediameter of the third lens element, the equation is designed forconfiguring CT3 and CT4 properly.

Reference is now made to Equation (8). Considering shortening of AC12and AC45 have more potential than shortening of AC23, the equation isdesigned for configuring AC12, AC23 and AC45 properly. Additionally, thevalue of AC23/(AC12+AC45) is suggested for a lower limit, such as0.20≦AC23/(AC12+AC45)≦2.00.

Reference is now made to Equation (9). It is understood that shorteningeach air gap effectively may result in a shortened length of the opticalimaging lens and also good optical characteristics. Consideringshortening of AC12, AC23 and AC45 have more potential than shortening ofAC34, the equation is designed for configuring AC12, AC23, AC34 and AC45properly. Additionally, the value of AC34/(AC12+AC23+AC45) is suggestedfor an upper limit, such as 1.60≦AC34/(AC12+AC23+AC45)≦3.40.

Reference is now made to Equation (10). Considering shortening of AC12,AC23 and AC45 have more potential than shortening of CT1, the equationis designed for configuring CT1, AC12, AC23 and AC45 properly.Additionally, the value of CT1/(AC12+AC23+AC45) is suggested for anupper limit, such as 1.80≦CT1/(AC12+AC23+AC45)≦3.50.

Reference is now made to Equation (11). Considering shortening of AC12and AC45 have more potential than shortening of CT4, the equation isdesigned for configuring CT4, AC12 and AC45 properly. Additionally, thevalue of CT4/(AC12+AC45) is suggested for a lower limit, such as5.50≦CT4/(AC12+AC45)≦6.90.

Reference is now made to Equation (12). Considering shortening of TLhave more potential than shortening of AC34, the equation is designedfor configuring TL and AC34 properly. Additionally, the value of TL/AC34is suggested for a lower limit, such as 6.00≦TL/AC34≦10.30.

Reference is now made to Equation (13). Considering shortening of CT1,CT4 and CT5 are limited by their light convergence function orsignificant effective diameter and shortening of CT3 has more potentialdue to its smaller effective diameter, the equation is designed forconfiguring CT3, CT4 and CT5 properly to achieve a shorter length of theoptical imaging lens. Additionally, the value of (CT1+CT4+CT5)/CT3 issuggested for an upper limit, such as 4.00≦(CT1+CT4+CT5)/CT3≦8.50.

Reference is now made to Equation (14). Considering shortening of AAGhave more potential than shortening of AC34, the equation is designedfor configuring AAG and AC34 properly. Additionally, the value ofAAG/AC34 is suggested for a lower limit, such as 1.10≦AAG/AC34≦1.60.

When implementing example embodiments, more details about the convex orconcave surface structure and/or the position of an aperture stop may beincorporated for one specific lens element or broadly for plural lenselements to enhance the control of the system performance and/orresolution, as illustrated in the following embodiments. For example, anaperture stop could be positioned before the first lens element, etc. Itis noted that the details listed here could be incorporated in exampleembodiments if no inconsistency occurs.

Several exemplary embodiments and associated optical data will now beprovided for illustrating example embodiments of optical imaging lenswith good optical characteristics and a shortened length. Reference isnow made to FIGS. 2-5. FIG. 2 illustrates an example cross-sectionalview of an optical imaging lens 1 having five lens elements of theoptical imaging lens according to a first example embodiment. FIG. 3shows example charts of longitudinal spherical aberration and otherkinds of optical aberrations of the optical imaging lens 1 according toan example embodiment. FIG. 4 illustrates an example table of opticaldata of each lens element of the optical imaging lens 1 according to anexample embodiment. FIG. 5 depicts an example table of aspherical dataof the optical imaging lens 1 according to an example embodiment.

As shown in FIG. 2, the optical imaging lens 1 of the present embodimentcomprises, in order from an object side A1 to an image side A2 along anoptical axis, an aperture stop 100, a first lens element 110, a secondlens element 120, a third lens element 130, a fourth lens element 140and a fifth lens element 150. A filtering unit 160 and an image plane170 of an image sensor are positioned at the image side A2 of theoptical lens 1. Each of the first, second, third, fourth, fifth lenselements 110, 120, 130, 140, 150 and the filtering unit 160 comprises anobject-side surface 111/121/131/141/151/161 facing toward the objectside A1 and an image-side surface 112/122/132/142/152/162 facing towardthe image side A2. The example embodiment of the filtering unit 160illustrated is an IR cut filter (infrared cut filter) positioned betweenthe fifth lens element 150 and an image plane 170. The filtering unit160 selectively absorbs light with specific wavelength from the lightpassing optical imaging lens 1. For example, IR light is absorbed, andthis will prohibit the IR light which is not seen by human eyes fromproducing an image on the image plane 170.

Exemplary embodiments of each lens element of the optical imaging lens 1which may be constructed by plastic material will now be described withreference to the drawings.

An example embodiment of the first lens element 110 may have positiverefracting power. The object-side surface 111 and the image-side surface112 are convex surfaces. The object-side surface 111 further comprises aconvex portion 1111 in a vicinity of a periphery of the optical axis.

An example embodiment of the second lens element 120 may have positiverefracting power. The object-side surface 121 is a concave surface andthe image-side surface 122 is a convex surface.

An example embodiment of the third lens element 130 may have negativerefracting power. The object-side surface 131 comprises a convex portion1311 in a vicinity of the optical axis and a concave portion 1312 in avicinity of a periphery of the third lens element 130. The image-sidesurface 132 comprises a concave portion 1321 in a vicinity of theoptical axis and a convex portion 1322 in a vicinity of a periphery ofthe third lens element 130.

An example embodiment of the fourth lens element 140 may have positiverefracting power. The object-side surface 141 is a concave surface. Theimage-side surface 142 comprises a convex portion 1421 in a vicinity ofthe optical axis and a concave portion 1422 in a vicinity of a peripheryof the fourth lens element 140.

An example embodiment of the fifth lens element 150 may have negativerefracting power. The object-side surface 151 comprises a convex portion1511 in a vicinity of the optical axis and a concave portion 1512 in avicinity of a periphery of the fifth lens element 150. The image-sidesurface 152 comprises a concave portion 1521 in a vicinity of theoptical axis and a convex portion 1522 in a vicinity of a periphery ofthe fifth lens element 150.

In example embodiments, air gaps exist between the lens elements 110,120, 130, 140, 150, the filtering unit 160 and the image plane 170 ofthe image sensor. For example, FIG. 1 illustrates the air gap d1existing between the first lens element 110 and the second lens element120, the air gap d2 existing between the second lens element 120 and thethird lens element 130, the air gap d3 existing between the third lenselement 130 and the fourth lens element 140, the air gap d4 existingbetween the fourth lens element 140 and the fifth lens element 150, theair gap d5 existing between the fifth lens element 150 and the filteringunit 160, and the air gap d6 existing between the filtering unit 160 andthe image plane 170 of the image sensor. However, in other embodiments,any of the aforesaid air gaps may or may not exist. For example, theprofiles of opposite surfaces of any two adjacent lens elements maycorrespond to each other, and in such situation, the air gap may notexist. The air gap d1 is denoted by AC12, the air gap d2 is denoted byAC23, the air gap d3 is denoted by AC34, the air gap d4 is denoted byAC45, and the sum of all air gaps d1, d2, d3 and d4 between the firstand fifth lens elements 110, 150 is denoted by AAG.

FIG. 4 depicts the optical characteristics of each lens elements in theoptical imaging lens 1 of the present embodiment, wherein the values ofTL/CT5, (AC23+AC34)/CT3, TL/AAG, (CT1+CT5)/CT3, TL/(AC12+AC23+AC45),CT5/(AC12+AC23+AC45), CT4/CT3, AC23/(AC12+AC45), AC34/(AC12+AC23+AC45),CT1/(AC12+AC23+AC45), CT4/(AC12+AC45), TL/AC34, (CT1+CT4+CT5)/CT3 andAAG/AC34 are:

TL/CT5=4.41, satisfying equation (1);

(AC23+AC34)/CT3=2.06, satisfying equation (2);

TL/AAG=4.78, satisfying equation (3);

(CT1+CT5)/CT3=4.59, satisfying equation (4);

TL/(AC12+AC23+AC45)=12.75, satisfying equation (5);

CT5/(AC12+AC23+AC45)=2.89, satisfying equation (6);

CT4/CT3=2.65, satisfying equation (7);

AC23/(AC12+AC45)=0.98, satisfying equation (8);

AC34/(AC12+AC23+AC45)=1.67, satisfying equation (9);

CT1/(AC12+AC23+AC45)=1.93, satisfying equation (10);

CT4/(AC12+AC45)=5.50, satisfying equation (11);

TL/AC34=7.65, satisfying equation (12);

(CT1+CT4+CT5)/CT3=7.24, satisfying equation (13);

AAG/AC34=1.60, satisfying equation (14);

wherein the distance from the object-side surface 111 of the first lenselement 110 to the image plane 170 along the optical axis is 3.77 mm,and the length of the optical imaging lens 1 is shortened.

The aspherical surfaces, including the object-side surface 111 and theimage-side surface 112 of the first lens element 110, the object-sidesurface 121 and the image-side surface 122 of the second lens element120, the object-side surface 131 and the image-side surface 132 of thethird lens element 130, the object-side surface 141 and the image-sidesurface 142 of the fourth lens element 140, and the object-side surface151 and the image-side surface 152 of the fifth lens element 150 are alldefined by the following aspherical formula:

${Z(Y)} = {{\frac{Y^{2}}{R}/\left( {1 + \sqrt{1 - {\left( {1 + K} \right)\frac{Y^{2}}{R^{2}}}}} \right)} + {\sum\limits_{i = 1}^{n}{a_{2i} \times Y^{2i}}}}$

wherein,

R represents the radius of curvature of the surface of the lens element;

Z represents the depth of the aspherical surface (the perpendiculardistance between the point of the aspherical surface at a distance Yfrom the optical axis and the tangent plane of the vertex on the opticalaxis of the aspherical surface);

Y represents the perpendicular distance between the point of theaspherical surface and the optical axis;

K represents a conic constant;

a_(2i) represents an aspherical coefficient of 2i^(th) level.

The values of each aspherical parameter are shown in FIG. 5.

As illustrated in FIG. 3, longitudinal spherical aberration (a), in viewof the vertical deviation of each curve, the offset of the off-axislight relative to the image point is within ±0.02 mm. Therefore, thepresent embodiment improves the longitudinal spherical aberration withrespect to different wavelengths.

Please refer to FIG. 3, astigmatism aberration in the sagittal direction(b) and astigmatism aberration in the tangential direction (c). Thefocus variation with respect to the three wavelengths in the whole fieldfalls within ±0.08 mm. This reflects the optical imaging lens 1 of thepresent embodiment eliminates aberration effectively.

Please refer to FIG. 3, distortion aberration (d), which shows thevariation of the distortion aberration is within ±2%. Such distortionaberration meets the requirement of acceptable image quality and showsthe optical imaging lens 1 of the present embodiment could restrict thedistortion aberration to raise the image quality even though the lengthof the optical imaging lens 1 is shortened to 3.77 mm.

Therefore, the optical imaging lens 1 of the present embodiment showsgreat characteristics in the longitudinal spherical aberration,astigmatism in the sagittal direction, astigmatism in the tangentialdirection, and distortion aberration. According to the aboveillustration, the optical imaging lens 1 of the example embodimentindeed achieves great optical performance and the length of the opticalimaging lens 1 is effectively shortened.

Reference is now made to FIGS. 6-9. FIG. 6 illustrates an examplecross-sectional view of an optical imaging lens 2 having five lenselements of the optical imaging lens according to a second exampleembodiment. FIG. 7 shows example charts of longitudinal sphericalaberration and other kinds of optical aberrations of the optical imaginglens 2 according to the second example embodiment. FIG. 8 shows anexample table of optical data of each lens element of the opticalimaging lens 2 according to the second example embodiment. FIG. 9 showsan example table of aspherical data of the optical imaging lens 2according to the second example embodiment. The reference numberslabeled in the present embodiment are similar to those in the firstembodiment for the similar elements, but here the reference numbers areinitialed with 2, for example, reference number 231 for labeling theobject-side surface of the third lens element 230, reference number 232for labeling the image-side surface of the third lens element 230, etc.

As shown in FIG. 6, the optical imaging lens 2 of the presentembodiment, in an order from an object side A1 to an image side A2 alongan optical axis, comprises an aperture stop 200, the first lens element210, a second lens element 220, a third lens element 230, a fourth lenselement 240 and a fifth lens element 250.

The differences between the second embodiment and the first embodimentare the radius of curvature and thickness of each lens element, thedistance of each air gap and the surface shape of the object-sidesurface 231 and the image-side surface 242, but the configuration of thepositive/negative refracting power of the first, second, third, fourthand fifth lens elements 210, 220, 230, 240 and 250 and configuration ofthe concave/convex shape of surfaces, comprising the object-sidesurfaces 211, 221, 241, 251 facing to the object side A1 and theimage-side surfaces 212, 222, 232, 252 facing to the image side A2, aresimilar to those in the first embodiment. Specifically, the object-sidesurface 221 of the second lens element 220 is a concave surface and theimage-side surface 232 of the third lens element 230 is a convex surfacecomprising a convex portion 2321 in a vicinity of the optical axis.Please refer to FIG. 8 for the optical characteristics of each lenselements in the optical imaging lens 2 of the present embodiment,wherein the values of TL/CT5, (AC23+AC34)/CT3, TL/AAG, (CT1+CT5)/CT3,TL/(AC12+AC23+AC45), CT5/(AC12+AC23+AC45), CT4/CT3, AC23/(AC12+AC45),AC34/(AC12+AC23+AC45), CT1/(AC12+AC23+AC45), CT4/(AC12+AC45), TL/AC34,(CT1+CT4+CT5)/CT3 and AAG/AC34 are:

TL/CT5=7.79, satisfying equation (1);

(AC23+AC34)/CT3=1.70, satisfying equation (2);

TL/AAG=5.37, satisfying equation (3);

(CT1+CT5)/CT3=3.77, satisfying equation (4);

TL/(AC12+AC23+AC45)=14.41, satisfying equation (5);

CT5/(AC12+AC23+AC45)=1.85, satisfying equation (6);

CT4/CT3=3.42;

AC23/(AC12+AC45)=0.39, satisfying equation (8);

AC34/(AC12+AC23+AC45)=1.68, satisfying equation (9);

CT1/(AC12+AC23+AC45)=2.51, satisfying equation (10);

CT4/(AC12+AC45)=5.50, satisfying equation (11);

TL/AC34=8.56, satisfying equation (12);

(CT1+CT4+CT5)/CT3=7.19, satisfying equation (13);

AAG/AC34=1.59, satisfying equation (14);

wherein the distance from the object-side surface 211 of the first lenselement 210 to the image plane 270 along the optical axis is 4.45 mm andthe length of the optical imaging lens 2 is shortened.

As shown in FIG. 7, the optical imaging lens 2 of the present embodimentshows great characteristics in longitudinal spherical aberration (a),astigmatism in the sagittal direction (b), astigmatism in the tangentialdirection (c), and distortion aberration (d). Therefore, according tothe above illustration, the optical imaging lens of the presentembodiment indeed shows great optical performance and the length of theoptical imaging lens 2 is effectively shortened.

Reference is now made to FIGS. 10-13. FIG. 10 illustrates an examplecross-sectional view of an optical imaging lens 3 having five lenselements of the optical imaging lens according to a third exampleembodiment. FIG. 11 shows example charts of longitudinal sphericalaberration and other kinds of optical aberrations of the optical imaginglens 3 according to the third example embodiment. FIG. 12 shows anexample table of optical data of each lens element of the opticalimaging lens 3 according to the third example embodiment. FIG. 13 showsan example table of aspherical data of the optical imaging lens 3according to the third example embodiment. The reference numbers labeledin the present embodiment are similar to those in the first embodimentfor the similar elements, but here the reference numbers are initialedwith 3, for example, reference number 331 for labeling the object-sidesurface of the third lens element 330, reference number 332 for labelingthe image-side surface of the third lens element 330, etc.

As shown in FIG. 10, the optical imaging lens 3 of the presentembodiment, in an order from an object side A1 to an image side A2 alongan optical axis, comprises an aperture stop 300, the first lens element310, a second lens element 320, a third lens element 330, a fourth lenselement 340 and a fifth lens element 350.

The differences between the third embodiment and the first embodimentare the radius of curvature and thickness of each lens element, thedistance of each air gap and the surface shape of the object-sidesurface 331, but the configuration of the positive/negative refractingpower of the first, second, third, fourth and fifth lens elements 310,320, 330, 340, 350 and configuration of the concave/convex shape ofsurfaces, comprising the object-side surfaces 311, 321, 331, 341, 351facing to the object side A1 and the image-side surfaces 312, 322, 332,342, 352 facing to the image side A2, are similar to those in the firstembodiment. Specifically, the object-side surface 331 of the third lenselement 330 is a concave surface. Please refer to FIG. 12 for theoptical characteristics of each lens elements in the optical imaginglens 3 of the present embodiment, wherein the values of TL/CT5,(AC23+AC34)/CT3, TL/AAG, (CT1+CT5)/CT3, TL/(AC12+AC23+AC45),CT5/(AC12+AC23+AC45), CT4/CT3, AC23/(AC12+AC45), AC34/(AC12+AC23+AC45),CT1/(AC12+AC23+AC45), CT4/(AC12+AC45), TL/AC34, (CT1+CT4+CT5)/CT3 andAAG/AC34 are:

TL/CT5=4.85, satisfying equation (1);

(AC23+AC34)/CT3=1.10, satisfying equation (2);

TL/AAG=6.31, satisfying equation (3);

(CT1+CT5)/CT3=3.75, satisfying equation (4);

TL/(AC12+AC23+AC45)=16.84, satisfying equation (5);

CT5/(AC12+AC23+AC45)=3.47, satisfying equation (6);

CT4/CT3=2.17, satisfying equation (7);

AC23/(AC12+AC45)=0.42, satisfying equation (8);

AC34/(AC12+AC23+AC45)=1.67, satisfying equation (9);

CT1/(AC12+AC23+AC45)=3.22, satisfying equation (10);

CT4/(AC12+AC45)=5.50, satisfying equation (11);

TL/AC34=10.10, satisfying equation (12);

(CT1+CT4+CT5)/CT3=5.92, satisfying equation (13);

AAG/AC34=1.60, satisfying equation (14);

wherein the distance from the object-side surface 311 of the first lenselement 310 to the image plane 370 along the optical axis is 3.93 mm andthe length of the optical imaging lens 3 is shortened.

As shown in FIG. 11, the optical imaging lens 3 of the presentembodiment shows great characteristics in longitudinal sphericalaberration (a), astigmatism in the sagittal direction (b), astigmatismin the tangential direction (c), and distortion aberration (d).Therefore, according to the above illustration, the optical imaging lensof the present embodiment indeed shows great optical performance and thelength of the optical imaging lens 3 is effectively shortened.

Reference is now made to FIGS. 14-17. FIG. 14 illustrates an examplecross-sectional view of an optical imaging lens 4 having five lenselements of the optical imaging lens according to a fourth exampleembodiment. FIG. 15 shows example charts of longitudinal sphericalaberration and other kinds of optical aberrations of the optical imaginglens 4 according to the fourth embodiment. FIG. 16 shows an exampletable of optical data of each lens element of the optical imaging lens 4according to the fourth example embodiment. FIG. 17 shows an exampletable of aspherical data of the optical imaging lens 4 according to thefourth example embodiment. The reference numbers labeled in the presentembodiment are similar to those in the first embodiment for the similarelements, but here the reference numbers are initialed with 4, forexample, reference number 431 for labeling the object-side surface ofthe third lens element 430, reference number 432 for labeling theimage-side surface of the third lens element 430, etc.

As shown in FIG. 14, the optical imaging lens 4 of the presentembodiment, in an order from an object side A1 to an image side A2 alongan optical axis, comprises an aperture stop 400, the first lens element410, a second lens element 420, a third lens element 430, a fourth lenselement 440 and a fifth lens element 450.

The differences between the fourth embodiment and the first embodimentare the radius of curvature and thickness of each lens element and thedistance of each air gap, but the configuration of the positive/negativerefracting power of the first, second, third, fourth and fifth lenselements 410, 420, 430, 440, 450 and configuration of the concave/convexshape of surfaces, comprising the object-side surfaces 411, 421, 431,441, 451 facing to the object side A1 and the image-side surfaces 412,422, 432, 442, 452 facing to the image side A2, are similar to those inthe first embodiment. Please refer to FIG. 16 for the opticalcharacteristics of each lens elements in the optical imaging lens 4 ofthe present embodiment, wherein the values of TL/CT5, (AC23+AC34)/CT3,TL/AAG, (CT1+CT5)/CT3, TL/(AC12+AC23+AC45), CT5/(AC12+AC23+AC45),CT4/CT3, AC23/(AC12+AC45), AC34/(AC12+AC23+AC45), CT1/(AC12+AC23+AC45),CT4/(AC12+AC45), TL/AC34, (CT1+CT4+CT5)/CT3 and AAG/AC34 are:

TL/CT5=5.04, satisfying equation (1);

(AC23+AC34)/CT3=2.27, satisfying equation (2);

TL/AAG=4.30, satisfying equation (3);

(CT1+CT5)/CT3=4.16, satisfying equation (4);

TL/(AC12+AC23+AC45)=13.24, satisfying equation (5);

CT5/(AC12+AC23+AC45)=2.63, satisfying equation (6);

CT4/CT3=2.46, satisfying equation (7);

AC23/(AC12+AC45)=0.98, satisfying equation (8);

AC34/(AC12+AC23+AC45)=2.08, satisfying equation (9);

CT1/(AC12+AC23+AC45)=2.09, satisfying equation (10);

CT4/(AC12+AC45)=5.51, satisfying equation (11);

TL/AC34=6.37, satisfying equation (12);

(CT1+CT4+CT5)/CT3=6.63, satisfying equation (13);

AAG/AC34=1.48, satisfying equation (14);

wherein the distance from the object-side surface 411 of the first lenselement 410 to the image plane 470 along the optical axis is 3.93 mm andthe length of the optical imaging lens 4 is shortened.

As shown in FIG. 15, the optical imaging lens 4 of the presentembodiment shows great characteristics in longitudinal sphericalaberration (a), astigmatism in the sagittal direction (b), astigmatismin the tangential direction (c), and distortion aberration (d).Therefore, according to the above illustration, the optical imaging lensof the present embodiment indeed shows great optical performance and thelength of the optical imaging lens 4 is effectively shortened.

Reference is now made to FIGS. 18-21. FIG. 18 illustrates an examplecross-sectional view of an optical imaging lens 5 having five lenselements of the optical imaging lens according to a fifth exampleembodiment. FIG. 19 shows example charts of longitudinal sphericalaberration and other kinds of optical aberrations of the optical imaginglens 5 according to the fifth embodiment. FIG. 20 shows an example tableof optical data of each lens element of the optical imaging lens 5according to the fifth example embodiment. FIG. 21 shows an exampletable of aspherical data of the optical imaging lens 5 according to thefifth example embodiment. The reference numbers labeled in the presentembodiment are similar to those in the first embodiment for the similarelements, but here the reference numbers are initialed with 5, forexample, reference number 531 for labeling the object-side surface ofthe third lens element 530, reference number 532 for labeling theimage-side surface of the third lens element 530, etc.

As shown in FIG. 18, the optical imaging lens 5 of the presentembodiment, in an order from an object side A1 to an image side A2 alongan optical axis, comprises an aperture stop 500, the first lens element510, a second lens element 520, a third lens element 530, a fourth lenselement 540 and a fifth lens element 550.

The differences between the fifth embodiment and the first embodimentare the radius of curvature and thickness of each lens element, thedistance of each air gap and the surface shape of the object-sidesurface 531, but the configuration of the positive/negative refractingpower of the first, second, third, fourth and fifth lens elements 510,520, 530, 540, 550 and configuration of the concave/convex shape ofsurfaces, comprising the object-side surfaces 511, 521, 531, 541, 551facing to the object side A1 and the image-side surfaces 512, 522, 532,542, 552 facing to the image side A2, are similar to those in the firstembodiment. Specifically, the object-side surface 531 of the third lenselement 530 is a concave surface. Please refer to FIG. 20 for theoptical characteristics of each lens elements in the optical imaginglens 5 of the present embodiment, wherein the values of TL/CT5,(AC23+AC34)/CT3, TL/AAG, (CT1+CT5)/CT3, TL/(AC12+AC23+AC45),CT5/(AC12+AC23+AC45), CT4/CT3, AC23/(AC12+AC45), AC34/(AC12+AC23+AC45),CT1/(AC12+AC23+AC45), CT4/(AC12+AC45), TL/AC34, (CT1+CT4+CT5)/CT3 andAAG/AC34 are:

TL/CT5=5.04, satisfying equation (1);

(AC23+AC34)/CT3=2.13, satisfying equation (2);

TL/AAG=4.30, satisfying equation (3);

(CT1+CT5)/CT3=3.88, satisfying equation (4);

TL/(AC12+AC23+AC45)=12.59, satisfying equation (5);

CT5/(AC12+AC23+AC45)=2.50, satisfying equation (6);

CT4/CT3=2.31, satisfying equation (7);

AC23/(AC12+AC45)=1.07, satisfying equation (8);

AC34/(AC12+AC23+AC45)=1.93, satisfying equation (9);

CT1/(AC12+AC23+AC45)=1.95, satisfying equation (10);

CT4/(AC12+AC45)=5.50, satisfying equation (11);

TL/AC34=6.54, satisfying equation (12);

(CT1+CT4+CT5)/CT3=6.19, satisfying equation (13);

AAG/AC34=1.52, satisfying equation (14);

wherein the distance from the object-side surface 511 of the first lenselement 510 to the image plane 570 along the optical axis is 3.94 mm andthe length of the optical imaging lens 5 is shortened.

As shown in FIG. 19, the optical imaging lens 5 of the presentembodiment shows great characteristics in longitudinal sphericalaberration (a), astigmatism in the sagittal direction (b), astigmatismin the tangential direction (c), and distortion aberration (d).Therefore, according to the above illustration, the optical imaging lensof the present embodiment indeed shows great optical performance and thelength of the optical imaging lens 5 is effectively shortened.

Reference is now made to FIGS. 22-25. FIG. 22 illustrates an examplecross-sectional view of an optical imaging lens 6 having five lenselements of the optical imaging lens according to a sixth exampleembodiment. FIG. 23 shows example charts of longitudinal sphericalaberration and other kinds of optical aberrations of the optical imaginglens 6 according to the sixth embodiment. FIG. 24 shows an example tableof optical data of each lens element of the optical imaging lens 6according to the sixth example embodiment. FIG. 25 shows an exampletable of aspherical data of the optical imaging lens 6 according to thesixth example embodiment. The reference numbers labeled in the presentembodiment are similar to those in the first embodiment for the similarelements, but here the reference numbers are initialed with 6, forexample, reference number 631 for labeling the object-side surface ofthe third lens element 630, reference number 632 for labeling theimage-side surface of the third lens element 630, etc.

As shown in FIG. 22, the optical imaging lens 6 of the presentembodiment, in an order from an object side A1 to an image side A2 alongan optical axis, comprises an aperture stop 600, the first lens element610, a second lens element 620, a third lens element 630, a fourth lenselement 640 and a fifth lens element 650.

The differences between the sixth embodiment and the first embodimentare the radius of curvature and thickness of each lens element, thedistance of each air gap and the surface shape of the object-sidesurface 651, but the configuration of the positive/negative refractingpower of the first, second, third, fourth and fifth lens elements 610,620, 630, 640, 650 and configuration of the concave/convex shape ofsurfaces, comprising the object-side surfaces 611, 621, 631, 641, 651facing to the object side A1 and the image-side surfaces 612, 622, 632,642, 652 facing to the image side A2, are similar to those in the firstembodiment. Specifically, the object-side surface 651 of the fifth lenselement 650 comprises a convex portion 6511 in a vicinity of the opticalaxis, a convex portion 6512 in a vicinity of a periphery of the fifthlens element 650 and a concave portion 6513 between the vicinity of theoptical axis and the vicinity of the periphery of the fifth lens element650. Please refer to FIG. 24 for the optical characteristics of eachlens elements in the optical imaging lens 6 of the present embodiment,wherein the values of TL/CT5, (AC23+AC34)/CT3, TL/AAG, (CT1+CT5)/CT3,TL/(AC12+AC23+AC45), CT5/(AC12+AC23+AC45), CT4/CT3, AC23/(AC12+AC45),AC34/(AC12+AC23+AC45), CT1/(AC12+AC23+AC45), CT4/(AC12+AC45), TL/AC34,(CT1+CT4+CT5)/CT3 and AAG/AC34 are:

TL/CT5=5.15, satisfying equation (1);

(AC23+AC34)/CT3=2.06, satisfying equation (2);

TL/AAG=4.55, satisfying equation (3);

(CT1+CT5)/CT3=5.72, satisfying equation (4);

TL/(AC12+AC23+AC45)=9.90, satisfying equation (5);

CT5/(AC12+AC23+AC45)=1.92, satisfying equation (6);

CT4/CT3=2.44, satisfying equation (7);

AC23/(AC12+AC45)=0.50, satisfying equation (8);

AC34/(AC12+AC23+AC45)=1.18;

CT1/(AC12+AC23+AC45)=2.28, satisfying equation (10);

CT4/(AC12+AC45)=2.69;

TL/AC34=8.42, satisfying equation (12);

(CT1+CT4+CT5)/CT3=8.17, satisfying equation (13);

AAG/AC34=1.85;

wherein the distance from the object-side surface 611 of the first lenselement 610 to the image plane 670 along the optical axis is 4.03 mm andthe length of the optical imaging lens 6 is shortened.

As shown in FIG. 23, the optical imaging lens 6 of the presentembodiment shows great characteristics in longitudinal sphericalaberration (a), astigmatism in the sagittal direction (b), astigmatismin the tangential direction (c), and distortion aberration (d).Therefore, according to the above illustration, the optical imaging lensof the present embodiment indeed shows great optical performance and thelength of the optical imaging lens 6 is effectively shortened.

Reference is now made to FIGS. 26-29. FIG. 26 illustrates an examplecross-sectional view of an optical imaging lens 7 having five lenselements of the optical imaging lens according to a seventh exampleembodiment. FIG. 27 shows example charts of longitudinal sphericalaberration and other kinds of optical aberrations of the optical imaginglens 7 according to the seventh embodiment. FIG. 28 shows an exampletable of optical data of each lens element of the optical imaging lens 7according to the seventh example embodiment. FIG. 29 shows an exampletable of aspherical data of the optical imaging lens 7 according to theseventh example embodiment. The reference numbers labeled in the presentembodiment are similar to those in the first embodiment for the similarelements, but here the reference numbers are initialed with 7, forexample, reference number 731 for labeling the object-side surface ofthe third lens element 730, reference number 732 for labeling theimage-side surface of the third lens element 730, etc.

As shown in FIG. 26, the optical imaging lens 7 of the presentembodiment, in an order from an object side A1 to an image side A2 alongan optical axis, comprises an aperture stop 700, the first lens element710, a second lens element 720, a third lens element 730, a fourth lenselement 740 and a fifth lens element 750.

The differences between the seventh embodiment and the first embodimentare the radius of curvature and thickness of each lens element, thedistance of each air gap and the surface shape of the object-sidesurface 731, but the configuration of the positive/negative refractingpower of the first, second, third, fourth and fifth lens elements 710,720, 730, 740, 750 and configuration of the concave/convex shape ofsurfaces, comprising the object-side surfaces 711, 721, 731, 741, 751facing to the object side A1 and the image-side surfaces 712, 722, 732,742, 752 facing to the image side A2, are similar to those in the firstembodiment. Specifically, the object-side surface 731 of the third lenselement 730 is a concave surface. Please refer to FIG. 28 for theoptical characteristics of each lens elements in the optical imaginglens 7 of the present embodiment, wherein the values of TL/CT5,(AC23+AC34)/CT3, TL/AAG, (CT1+CT5)/CT3, TL/(AC12+AC23+AC45),CT5/(AC12+AC23+AC45), CT4/CT3, AC23/(AC12+AC45), AC34/(AC12+AC23+AC45),CT1/(AC12+AC23+AC45), CT4/(AC12+AC45), TL/AC34, (CT1+CT4+CT5)/CT3 andAAG/AC34 are:

TL/CT5=4.76, satisfying equation (1);

(AC23+AC34)/CT3=1.47, satisfying equation (2);

TL/AAG=5.18, satisfying equation (3);

(CT1+CT5)/CT3=3.75, satisfying equation (4);

TL/(AC12+AC23+AC45)=14.94, satisfying equation (5);

CT5/(AC12+AC23+AC45)=3.14, satisfying equation (6);

CT4/CT3=1.76, satisfying equation (7);

AC23/(AC12+AC45)=0.93, satisfying equation (8);

AC34/(AC12+AC23+AC45)=1.88, satisfying equation (9);

CT1/(AC12+AC23+AC45)=2.90, satisfying equation (10);

CT4/(AC12+AC45)=5.50, satisfying equation (11);

TL/AC34=7.93, satisfying equation (12);

(CT1+CT4+CT5)/CT3=5.51, satisfying equation (13);

AAG/AC34=1.53, satisfying equation (14);

wherein the distance from the object-side surface 711 of the first lenselement 710 to the image plane 770 along the optical axis is 3.99 mm andthe length of the optical imaging lens 7 is shortened.

As shown in FIG. 27, the optical imaging lens 7 of the presentembodiment shows great characteristics in longitudinal sphericalaberration (a), astigmatism in the sagittal direction (b), astigmatismin the tangential direction (c), and distortion aberration (d).Therefore, according to the above illustration, the optical imaging lensof the present embodiment indeed shows great optical performance and thelength of the optical imaging lens 7 is effectively shortened.

Reference is now made to FIGS. 30-33. FIG. 30 illustrates an examplecross-sectional view of an optical imaging lens 8 having five lenselements of the optical imaging lens according to a eighth exampleembodiment. FIG. 31 shows example charts of longitudinal sphericalaberration and other kinds of optical aberrations of the optical imaginglens 8 according to the eighth embodiment. FIG. 32 shows an exampletable of optical data of each lens element of the optical imaging lens 8according to the eighth example embodiment. FIG. 33 shows an exampletable of aspherical data of the optical imaging lens 8 according to theeighth example embodiment. The reference numbers labeled in the presentembodiment are similar to those in the first embodiment for the similarelements, but here the reference numbers are initialed with 8, forexample, reference number 831 for labeling the object-side surface ofthe third lens element 830, reference number 832 for labeling theimage-side surface of the third lens element 830, etc.

As shown in FIG. 30, the optical imaging lens 8 of the presentembodiment, in an order from an object side A1 to an image side A2 alongan optical axis, comprises an aperture stop 800, the first lens element810, a second lens element 820, a third lens element 830, a fourth lenselement 840 and a fifth lens element 850.

The differences between the eighth embodiment and the first embodimentare the radius of curvature and thickness of each lens element, thedistance of each air gap and the surface shape of the object-sidesurface 831, but the configuration of the positive/negative refractingpower of the first, second, third, fourth and fifth lens elements 810,820, 830, 840, 850 and configuration of the concave/convex shape ofsurfaces, comprising the object-side surfaces 811, 821, 831, 841, 851facing to the object side A1 and the image-side surfaces 812, 822, 832,842, 852 facing to the image side A2, are similar to those in the firstembodiment. Specifically, the object-side surface 831 of the third lenselement 830 is a concave surface. Please refer to FIG. 32 for theoptical characteristics of each lens elements in the optical imaginglens 8 of the present embodiment, wherein the values of TL/CT5,(AC23+AC34)/CT3, TL/AAG, (CT1+CT5)/CT3, TL/(AC12+AC23+AC45),CT5/(AC12+AC23+AC45), CT4/CT3, AC23/(AC12+AC45), AC34/(AC12+AC23+AC45),CT1/(AC12+AC23+AC45), CT4/(AC12+AC45), TL/AC34, (CT1+CT4+CT5)/CT3 andAAG/AC34 are:

TL/CT5=4.91, satisfying equation (1);

(AC23+AC34)/CT3=1.79, satisfying equation (2);

TL/AAG=5.62, satisfying equation (3);

(CT1+CT5)/CT3=4.98, satisfying equation (4);

TL/(AC12+AC23+AC45)=15.67, satisfying equation (5);

CT5/(AC12+AC23+AC45)=3.19, satisfying equation (6);

CT4/CT3=3.10, satisfying equation (7);

AC23/(AC12+AC45)=0.73, satisfying equation (8);

AC34/(AC12+AC23+AC45)=1.79, satisfying equation (9);

CT1/(AC12+AC23+AC45)=2.95, satisfying equation (10);

CT4/(AC12+AC45)=6.60, satisfying equation (11);

TL/AC34=8.76, satisfying equation (12);

(CT1+CT4+CT5)/CT3=8.09, satisfying equation (13);

AAG/AC34=1.56, satisfying equation (14);

wherein the distance from the object-side surface 811 of the first lenselement 810 to the image plane 870 along the optical axis is 3.95 mm andthe length of the optical imaging lens 8 is shortened.

As shown in FIG. 31, the optical imaging lens 8 of the presentembodiment shows great characteristics in longitudinal sphericalaberration (a), astigmatism in the sagittal direction (b), astigmatismin the tangential direction (c), and distortion aberration (d).Therefore, according to the above illustration, the optical imaging lensof the present embodiment indeed shows great optical performance and thelength of the optical imaging lens 8 is effectively shortened.

Please refer to FIG. 34, which shows the values of TL/CT5,(AC23+AC34)/CT3, TL/AAG, (CT1+CT5)/CT3, TL/(AC12+AC23+AC45),CT5/(AC12+AC23+AC45), CT4/CT3, AC23/(AC12+AC45), AC34/(AC12+AC23+AC45),CT1/(AC12+AC23+AC45), CT4/(AC12+AC45), TL/AC34, (CT1+CT4+CT5)/CT3 andAAG/AC34 of all ninth embodiments, and it is clear that the opticalimaging lens of the present invention satisfy the Equations (1), (2),(3), (4), (5), (6), (7), (8), (9), (10, (11), (12), (13) and/or (14).

Reference is now made to FIG. 35, which illustrates an examplestructural view of a first embodiment of mobile device 20 applying anaforesaid optical imaging lens. The mobile device 20 comprises a housing21 and a photography module 22 positioned in the housing 21. Examples ofthe mobile device 20 may be, but are not limited to, a mobile phone, acamera, a tablet computer, a personal digital assistant (PDA), etc.

As shown in FIG. 35, the photography module 22 may comprise an aforesaidoptical imaging lens with five lens elements, for example, the opticalimaging lens 1 of the first embodiment, a lens barrel 23 for positioningthe optical imaging lens 1, a module housing unit 24 for positioning thelens barrel 23, a substrate 172 for positioning the module housing unit24, and an image sensor 171 which is positioned at an image side of theoptical imaging lens 1. The image plane 170 is formed on the imagesensor 171.

In some other example embodiments, the structure of the filtering unit160 may be omitted. In some example embodiments, the housing 21, thelens barrel 23, and/or the module housing unit 24 may be integrated intoa single component or assembled by multiple components. In some exampleembodiments, the image sensor 171 used in the present embodiment isdirectly attached to a substrate 172 in the form of a chip on board(COB) package, and such package is different from traditional chip scalepackages (CSP) since a COB package does not require a cover glass beforethe image sensor 171 in the optical imaging lens 1. Aforesaid exemplaryembodiments are not limited to this package type and could beselectively incorporated in other described embodiments.

The five lens elements 110, 120, 130, 140, 150 are positioned in thelens barrel 23 in the way of separated by an air gap between any twoadjacent lens elements.

The module housing unit 24 comprises a lens backseat 2401 forpositioning the lens barrel 23 and an image sensor base 2406 positionedbetween the lens backseat 2401 and the image sensor 171. The lens barrel23 and the lens backseat 2401 are positioned along a same axis I-I′, andthe lens backseat 2401 is close to the outside of the lens barrel 23.The image sensor base 2406 is exemplarily close to the lens backseat2401 here. The image sensor base 2406 could be optionally omitted insome other embodiments of the present invention.

Because the length of the optical imaging lens 1 is merely 3.77 mm, thesize of the mobile device 20 may be quite small. Therefore, theembodiments described herein meet the market demand for smaller sizedproduct designs.

Reference is now made to FIG. 36, which shows another structural view ofa second embodiment of mobile device 20′ applying the aforesaid opticalimaging lens 1. One difference between the mobile device 20′ and themobile device 20 may be the lens backseat 2401 comprising a first seatunit 2402, a second seat unit 2403, a coil 2404 and a magnetic unit2405. The first seat unit 2402 is close to the outside of the lensbarrel 23, and positioned along an axis I-I′, and the second seat unit2403 is around the outside of the first seat unit 2402 and positionedalong with the axis I-I′. The coil 2404 is positioned between the firstseat unit 2402 and the inside of the second seat unit 2403. The magneticunit 2405 is positioned between the outside of the coil 2404 and theinside of the second seat unit 2403.

The lens barrel 23 and the optical imaging lens 1 positioned therein aredriven by the first seat unit 2402 for moving along the axis I-I′. Therest structure of the mobile device 20′ is similar to the mobile device20.

Similarly, because the length of the optical imaging lens 1, 3.77 mm, isshortened, the mobile device 20′ can be designed with a smaller sizewhile still maintaining good optical performance. Therefore, the presentembodiment meets the demand of a small sized product design and therequest of the market.

According to the above illustration, it is clear that the mobile deviceand the optical imaging lens thereof in example embodiments, throughcontrolling the detail structure and/or reflection power of the lenselements, the length of the optical imaging lens is effectivelyshortened and good optical characteristics are still provided.

While various embodiments in accordance with the disclosed principlesbeen described above, it should be understood that they are presented byway of example only, and are not limiting. Thus, the breadth and scopeof exemplary embodiment(s) should not be limited by any of theabove-described embodiments, but should be defined only in accordancewith the claims and their equivalents issuing from this disclosure.Furthermore, the above advantages and features are provided in describedembodiments, but shall not limit the application of such issued claimsto processes and structures accomplishing any or all of the aboveadvantages.

Additionally, the section headings herein are provided for consistencywith the suggestions under 37 C.F.R. 1.77 or otherwise to provideorganizational cues. These headings shall not limit or characterize theinvention(s) set out in any claims that may issue from this disclosure.Specifically, a description of a technology in the “Background” is notto be construed as an admission that technology is prior art to anyinvention(s) in this disclosure. Furthermore, any reference in thisdisclosure to “invention” in the singular should not be used to arguethat there is only a single point of novelty in this disclosure.Multiple inventions may be set forth according to the limitations of themultiple claims issuing from this disclosure, and such claimsaccordingly define the invention(s), and their equivalents, that areprotected thereby. In all instances, the scope of such claims shall beconsidered on their own merits in light of this disclosure, but shouldnot be constrained by the headings herein.

What is claimed is:
 1. An optical imaging lens, sequentially from anobject side to an image side along an optical axis, comprising first,second, third, fourth and fifth lens elements, each of the first,second, third, fourth and fifth lens elements having an object-sidesurface facing toward the object side and an image-side surface facingtoward the image side, wherein: the object-side surface of the firstlens element comprises a convex portion in a vicinity of the opticalaxis, the image-side surface of the first lens element comprises aconvex portion in a vicinity of the optical axis; the second lenselement has positive refracting power; the image-side surface of thethird lens element comprises a convex portion in a vicinity of aperiphery of the third lens element; the image-side surface of thefourth lens element comprises a convex portion in a vicinity of theoptical axis; the image-side surface of the fifth lens element comprisesa concave portion in a vicinity of the optical axis and a convex portionin a vicinity of a periphery of the fifth lens element; the opticalimaging lens as a whole comprises only the five lens elements havingrefracting power; and a distance between the object-side surface of thefirst lens element and the image-side surface of the fifth lens elementalong the optical axis is TL, a central thickness of the fifth lenselement along the optical axis is CT5, and TL and CT5 satisfy theequation:TL/CT5≦7.80; an air gap between the third lens element and the fourthlens element along the optical axis is AC34, and TL and AC34 satisfy theequation:6.00≦TL/AC34≦10.30.
 2. The optical imaging lens according to claim 1,wherein the image-side surface of the third lens element comprises aconcave portion in a vicinity of the optical axis.
 3. The opticalimaging lens according to claim 2, wherein a central thickness of thethird lens element along the optical axis is CT3, an air gap between thesecond lens element and the third lens element along the optical axis isAC23, and CT3, AC23 and AC34 satisfy the equation:1.10≦(AC23+AC34)/CT3≦2.50; and wherein the object-side surface of thefifth lens element comprises a convex portion in a vicinity of theoptical axis.
 4. The optical imaging lens according to claim 3, whereina sum of all four air gaps from the first lens element to the fifth lenselement along the optical axis is AAG, and TL and AAG satisfy theequation:4.30≦TL/AAG≦6.60.
 5. The optical imaging lens according to claim 4,wherein a central thickness of the first lens element along the opticalaxis is CT1, and CT1, CT3 and CT5 satisfy the equation:3.75≦(CT1+CT5)/CT3≦6.00.
 6. The optical imaging lens according to claim5, wherein an air gap between the first lens element and the second lenselement along the optical axis is AC12, an air gap between the fourthlens element and the fifth lens element along the optical axis is AC45,and TL, AC12, AC23 and AC45 satisfy the equation:9.80≦TL/(AC12+AC23+AC45)≦17.00.
 7. The optical imaging lens according toclaim 5, wherein an air gap between the first lens element and thesecond lens element along the optical axis is AC12, an air gap betweenthe fourth lens element and the fifth lens element along the opticalaxis is AC45, and CT5, AC12, AC23 and AC45 satisfy the equation:1.85≦CT5/(AC12+AC23+AC45)≦3.70.
 8. The optical imaging lens according toclaim 5, wherein a central thickness of the fourth lens element alongthe optical axis is CT4, and CT3 and CT4 satisfy the equation:1.60≦CT4/CT3≦3.40.
 9. The optical imaging lens according to claim 5,wherein an air gap between the first lens element and the second lenselement along the optical axis is AC12, an air gap between the fourthlens element and the fifth lens element along the optical axis is AC45,and AC12, AC23 and AC45 satisfy the equation:0.20≦AC23/(AC12+AC45)≦2.00.
 10. The optical imaging lens according toclaim 2, wherein a central thickness of the first lens element along theoptical axis is CT1, a central thickness of the third lens element alongthe optical axis is CT3, and CT1, CT3 and CT5 satisfy the equation:3.75≦(CT1+CT5)/CT3≦6.00.
 11. The optical imaging lens according to claim10, wherein an air gap between the first lens element and the secondlens element along the optical axis is AC12, an air gap between thesecond lens element and the third lens element along the optical axis isAC23, an air gap between the fourth lens element and the fifth lenselement along the optical axis is AC45, and AC12, AC23, AC34 and AC45satisfy the equation:1.60≦AC34/(AC12+AC23+AC45)≦3.40.
 12. The optical imaging lens accordingto claim 11, further comprising an aperture stop positioned before thefirst lens element.
 13. The optical imaging lens according to claim 10,wherein an air gap between the first lens element and the second lenselement along the optical axis is AC12, an air gap between the secondlens element and the third lens element along the optical axis is AC23,an air gap between the fourth lens element and the fifth lens elementalong the optical axis is AC45, and CT1, AG12, AC23 and AG45 satisfy theequation:1.80≦CT1/(AC12+AC23+AC45)≦3.50.
 14. The optical imaging lens accordingto claim 10, wherein a central thickness of the fourth lens elementalong the optical axis is CT4, an air gap between the first lens elementand the second lens element along the optical axis is AC12, an air gapbetween the fourth lens element and the fifth lens element along theoptical axis is AC45, and CT4, AC12 and AC45 satisfy the equation:5.50≦CT4/(AC12+AC45)≦6.90.
 15. The optical imaging lens according toclaim 2, wherein a central thickness of the first lens element along theoptical axis is CT1, a central thickness of the third lens element alongthe optical axis is CT3, a central thickness of the fourth lens elementalong the optical axis is CT4, and CT1, CT3, CT4 and CT5 satisfy theequation:4.00≦(CT1+CT4+CT5)/CT3≦8.50; and wherein the object-side surface of thefifth lens element comprises a convex portion in a vicinity of theoptical axis.
 16. The optical imaging lens according to claim 15,wherein a sum of all four air gaps from the first lens element to thefifth lens element along the optical axis is AAG, and AAG and AC34satisfy the equation:1.10≦AAG/AC34≦1.60.
 17. A mobile device, comprising: a housing; and aphotography module positioned in the housing and comprising: the opticalimaging lens as claimed in claim 1; a lens barrel for positioning theoptical imaging lens; a module housing unit for positioning the lensbarrel; and an image sensor positioned at the image side of the opticalimaging lens.